# Define Variables
str="Your Age Please:"
fname=  # nothing means null .. means remove it

# Wild Char
echo "List file name starting with r:"
ls r*
echo "List file name third char can be anything:"; ls re*d.sh   # can put two consecutive cmd in one line separate by ;

# Script to read your name from key-board
echo "Today's date is `date`."
echo $str
read age
echo `expr $age + 3`


#           Shell Built in Variables:
#   $#  Number of command line arguments. Useful to test no. of command line args in shell script.
#   $(num)  The parameter at specific number.
#   $*  All arguments to shell
#   $@  Same as above
#   $-  Option supplied to shell
#   $$  PID of shell
#   $!  PID of last started background process (started with &)
#   $?  exit status
